RE: 5x5 Arithmetic solver

[...]> > Thanks. Note that usually when you add a new functions, you can just> say "(fun1, fun2, fun3): New functions" without having to explain what> it does.>

Ok, I will commonalize those that can be.

Concerning the make-variable-local, I had the feeling that it is slightly better practice to do an explicit "dolist" --- I think that it is what is done in org-mode for instance --- at it allows to set the variable at the same time.